UpStairs on the Square hosted an opening-night party Wednesday for the cast and crew of the American Repertory Theatre’s production of “The Glass Menagerie.” Attendees included cast members Cherry Jones, Zachary Quinto, Celia Keenan-Bolger, and Brian J. Smith, ART artistic director Diane Paulus, and the show’s director, John Tiffany. Quinto tweeted that he got his opening-night suit from designer Todd Snyder, who had his New York Fashion Week show on Thursday.